WO2017133493A1

WO2017133493A1 - Virtual machine memory address assigning method and device

Info

Publication number: WO2017133493A1
Application number: PCT/CN2017/071928
Authority: WO
Inventors: 高蒙; 刘昆鹏
Original assignee: 华为技术有限公司
Priority date: 2016-02-03
Filing date: 2017-01-20
Publication date: 2017-08-10
Also published as: US10817432B2; CN107038121B; EP3401792A1; EP3401792A4; CN107038121A; US20180341595A1

Abstract

The application discloses a virtual machine memory address assigning method and device. A virtual machine operates on a host; the host comprises a physical memory area having power-down protection, and the virtual machine comprises a virtual memory area having power-down protection. The method comprises: the host determining whether a virtual memory address generated by the virtual machine and having a missing page interrupt belongs to the virtual memory area having power-down protection; and the host assigning, from the physical memory area having power-down protection, a physical memory address of the host for the virtual memory address. The method can effectively increase assignment efficiency.

Description

Virtual machine memory address allocation method and device

Technical field

The present application relates to the field of memory, and in particular, to a memory address allocation method and apparatus for a virtual machine.

Background technique

In the prior art, the host needs to allocate the physical memory address of the host from the physical memory area with power-down protection for the virtual memory address that the virtual machine has the power-off protection requirement, and must perform three mappings. First, the physical memory address of the physical memory area with power failure protection is mapped to a character device, and then the character device is remapped to an external device interconnection bus (English: Peripheral Component Interconnect, PCI for short), and finally, PCI is The device maps to the virtual machine's virtual memory address. However, in this mode, it is necessary to perform three mappings to realize the physical memory address of the virtual memory address that the virtual machine has the power-down protection requirement, but the allocation efficiency is low.

Summary of the invention

It is an object of the present invention to provide a memory address allocation method and apparatus for a virtual machine, which can improve the efficiency of assigning a physical memory address of a host having a power failure protection to a virtual memory address required for a power failure protection of a virtual machine.

In the first aspect, when the virtual machine generates a page fault interrupt, the host determines that the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power failure protection, and the virtual memory area with the power failure protection is the virtual machine. The virtual memory address allocates the physical memory address of the host.

After determining that the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power failure protection, the virtual memory address of the virtual machine is directly allocated the physical memory address of the host from the physical memory area with power failure protection. The efficiency of the physical memory address that the host has a power-down protection is increased by the virtual memory address that is required for the power-off protection of the virtual machine.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the host device stores information that the virtual memory area address is a virtual memory area with power-down protection, and generates a page fault interrupt in the virtual machine. The host queries the information according to the virtual memory address that generates the page fault interrupt, and determines that the virtual memory address belongs to the virtual memory area that has the power-down protection.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the virtual machine configuration file stores information that the virtual memory area address is a virtual memory area with power-down protection When the virtual machine generates a page fault interrupt, the host queries the information in the configuration file according to the virtual memory address that generates the page fault interrupt, and determines that the virtual memory address belongs to the virtual memory area with power failure protection.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the virtual memory area address is stored in the shared file of the host machine and the virtual machine as a power-down protection Information of the virtual memory area, when the virtual machine generates a page fault interrupt, the host queries the information in the shared file according to the virtual memory address that generates the page fault interrupt, and determines that the virtual memory address belongs to the power-down protection Virtual memory area.

In this embodiment, the shared file is accessible to both the host and the virtual machine. Therefore, after the host determines that the virtual memory area address is the virtual memory area with power-down protection, the virtual machine can also be based on its actual situation. The situation is modified by the virtual memory area address being the information of the virtual memory area with power-down protection.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the host device pre-stores information about the virtual memory address of the power-down protection that the process in the virtual machine needs to access, and the virtual machine generates a defect. When the page is interrupted, the host queries the information according to the virtual memory address that generates the page fault interrupt, and determines that the virtual memory address belongs to the virtual memory area with power-down protection.

With reference to any one of the first aspect to the fourth possible implementation, in a fifth possible implementation manner of the first aspect, the host The virtual memory address allocates the physical memory address of the host, and specifically includes:

The host establishes a mapping relationship between the virtual memory address and a physical memory address of the host.

With reference to any one of the first aspect to the fourth possible implementation, in a sixth possible implementation manner of the first aspect, the host is the physical memory area with the power failure protection The virtual memory address allocates the physical memory address of the host, and specifically includes:

The host establishes a mapping relationship between a physical memory address of the virtual machine and a physical memory address of the host; wherein the virtual memory address is mapped to a physical memory address of the virtual machine.

In a second aspect, the present invention provides a host machine for performing the method of any of the above first aspect or any of the possible implementations of the first aspect. In one implementation, specifically, the virtual machine runs on a host, the host includes a physical memory area with power-down protection, and the virtual machine includes a virtual memory area with power-down protection, and the host includes Means for performing the method of any of the above-described first aspect or any of the possible implementations of the first aspect. In another implementation, the host includes a processor and a memory, and the virtual machine runs on the host, and the memory of the host includes a physical memory area with power-down protection, and the virtual machine includes a power-down protection. A virtual memory area, the processor in communication with the memory, the processor being operative to perform the method of any of the first aspect or the first aspect of the first aspect. In another implementation, the host includes a memory management unit (English: Memory Management Unit, MMU for short) and a memory, and the virtual machine runs on the host, and the memory of the host includes power-down protection. a physical memory area, the virtual machine includes a virtual memory area with power-down protection, the MMU is in communication with the memory, and the MMU is configured to perform the method in any of the foregoing first aspect or any possible implementation manner of the first aspect . Specifically, the host in the present invention is a server.

In a third aspect, a computer readable medium is provided for storing a computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.

DRAWINGS

FIG. 1 is an application scenario of an embodiment of the present invention;

2 is a flowchart of a method for allocating a memory address of a virtual machine according to an embodiment of the present invention;

3 is a schematic structural diagram of a host machine according to an embodiment of the present invention;

4 is a schematic structural diagram of another host machine according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of still another host machine according to an embodiment of the present invention.

detailed description

The invention is described in detail below with reference to the drawings and embodiments.

As shown in Figure 1, the environment in which the virtual machine's memory address allocation method operates is described below. The virtual machine 120 runs on the host 110, and the host 110 includes a physical memory area 111 with power-down protection. The virtual machine 120 includes a virtual memory area 121 with power-down protection. Host 110 can be a server, workstation, laptop, desktop, tablet, or the like. The physical memory area 111 having the power-down protection is part or all of the physical memory of the host 110, and the data stored in the physical memory area 111 having the power-down protection can still be lost when power failure occurs, and the data can be prepared. The electrical device saves the data in the physical memory area 111 with the power-down protection to the non-volatile device, or in the embodiment of the present invention, the physical memory area 111 with the power-down protection refers to the physical memory that provides the power-down protection. The memory device in the area is a non-volatile memory device. After the power is turned off, the data in the memory device is not lost. The virtual memory area 121 with power-down protection is part or all of the virtual memory of the virtual machine 120, and the virtual memory area 121 with power-down protection is allocated with power-down protection when the physical memory address of the host 110 is allocated. The physical memory address of the physical memory area 111.

As shown in FIG. 2, in step 210, when the virtual machine generates a page fault interrupt, the host determines whether the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to a virtual memory area with power failure protection, and if it belongs to power failure protection. The virtual memory area proceeds to step 220: the host allocates the physical memory address of the host to the virtual memory address of the virtual machine from the physical memory area with power failure protection; if it does not belong to the virtual memory area with power failure protection, proceed to step 230. The host allocates the physical memory address of the host to the virtual memory address of the virtual machine from the physical memory area without power-down protection.

In the embodiment of the present invention, after determining that the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power failure protection, the host directly allocates the virtual memory address of the virtual machine from the physical memory area with power failure protection. The physical memory address of the host improves the efficiency of the physical memory address that the host has a power-down protection for the virtual memory address that the virtual machine has the power-down protection requirement.

In an embodiment of the present invention, the information of the virtual memory area address being the virtual memory area with power-down protection may be: the start address and length of the virtual memory area with power-down protection. Therefore, the host can determine the location of the virtual memory area with power-down protection according to the starting address and length of the virtual memory area with power-down protection, and the host machine will generate a page fault interrupt when the virtual machine generates a page fault interrupt. The virtual memory address is compared with the location of the virtual memory area with power-down protection to determine whether the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power-down protection. It can be understood that the information of the virtual memory area address being the virtual memory area with power-down protection may also be the start address and the end address of the virtual memory area with power-down protection, or the virtual memory area with power-down protection. End address And length and so on.

In a specific embodiment of the present invention, the method for determining whether the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to the virtual memory area with power failure protection is: the memory of the virtual memory area in the host storage is powered off. The information of the protected virtual memory area, when the virtual machine generates a page fault interrupt, the host queries the information according to the virtual memory address requested by the virtual machine, and determines whether the virtual memory address of the virtual machine belongs to the virtual protection with power failure protection according to the information. Memory area.

In a specific implementation, the information that the virtual memory area address is stored in the virtual memory area with the power-down protection may be: when the host creates the virtual machine, the host stores the virtual memory area address in the virtual machine's configuration file. Information for the virtual memory area protected by power loss. The configuration file of the virtual machine is an important parameter for recording a virtual machine, such as a central processing unit (English: Center Processing Unit, CPU) parameter, a memory parameter, a hard disk parameter, and the like. When the virtual machine generates a page fault interrupt, the host can query the virtual machine's configuration file according to the virtual machine's virtual memory address to determine whether the virtual machine's virtual memory address belongs to the virtual memory area with power-down protection.

In a specific implementation, the information that the virtual memory area address in the host machine is a virtual memory area with power-down protection may be: the host stores information of the virtual memory area whose virtual memory area address is power-down protection in the shared file. . The shared file is a file that can be accessed by both the host and the virtual machine, and can be a txt file, a word file, or the like. When the virtual machine generates a page fault interrupt, the host can query the shared file according to the virtual memory address of the virtual machine to determine whether the virtual memory address of the virtual machine belongs to the virtual memory area with power failure protection.

It can be understood that, since the shared file is accessible to both the host and the virtual machine, the virtual machine can also determine the information of the virtual memory area in which the virtual memory area address is the power-down protection is stored in the shared file. Access the shared file, and modify the information of the virtual memory area whose virtual memory area address is the power-down protection in the shared file according to the actual situation.

In a specific embodiment of the present invention, the host determines whether the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to the virtual memory area with power failure protection: the host needs to access the process in the virtual machine. The information of the virtual memory address with power failure protection, when the virtual machine generates a page fault interrupt, the host queries the information according to the virtual memory address requested by the virtual machine, and determines that the virtual memory address requested by the virtual machine is the virtual memory accessed by the process. address.

In a specific embodiment of the present invention, the host allocates the physical memory address of the host to the virtual memory address of the virtual machine from the physical memory area with the power failure protection, and specifically includes: the host establishes the virtual memory by using a shadow page table. The mapping between the address and the physical memory address of the host, or the host establishes a mapping between the physical memory address of the virtual machine and the physical memory address of the host by means of an extended page table (English: Extended Page Table, EPT). Relationship, where the virtual memory address is mapped to the virtual machine's physical memory address.

Referring to FIG. 3, FIG. 3 is a schematic structural diagram of a host machine according to an embodiment of the present invention. The virtual machine runs on a host, and the host includes a physical memory area with power-down protection, and the virtual machine includes An electrically protected virtual memory area, the host including a determining unit 310 and an allocating unit 320. among them,

a determining unit 310, configured to determine that the virtual machine generates a page fault interrupt virtual memory address belongs to the a virtual memory area with power-down protection;

The allocating unit 320 is configured to allocate a physical memory address of the host to the virtual memory address from the physical memory area with power failure protection.

In the embodiment of the present invention, after determining that the virtual memory address of the virtual machine generating the page fault interrupt belongs to the virtual memory area with power failure protection, the allocating unit 320 directly uses the virtual memory address of the virtual machine from the physical protection with power failure protection. The memory area allocates the physical memory address of the host, which improves the efficiency of assigning the physical memory address of the host to the power-down protection for the virtual memory address that the virtual machine has the power-down protection requirement.

In an embodiment of the present invention, the information of the virtual memory area address being the virtual memory area with power-down protection may be: the start address and length of the virtual memory area with power-down protection. Therefore, the determining unit 310 can determine the location of the virtual memory area with the power-down protection according to the start address and the length of the virtual memory area with the power-down protection, and the determining unit 310 will generate the page fault when the virtual machine generates the page fault interrupt. The interrupted virtual memory address is compared with the location of the virtual memory area with power-down protection to determine whether the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power-down protection. It can be understood that the information of the virtual memory area address being the virtual memory area with power-down protection may also be the start address and the end address of the virtual memory area with power-down protection, or the virtual memory area with power-down protection. End address and length, etc.

In a specific embodiment of the present invention, the determining unit 310 is configured to determine that the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power-down protection: the virtual machine memory address in the host storage is inactive. The information of the protected virtual memory area, when the virtual machine generates a page fault interrupt, the determining unit 310 queries the information according to the virtual memory address requested by the virtual machine, and determines, according to the information, whether the virtual memory address of the virtual machine belongs to the power-down protection. Virtual memory area.

In a specific implementation, the information that the virtual memory area address is stored in the virtual memory area with the power-down protection may be: when the host creates the virtual machine, the host stores the virtual memory area address in the virtual machine's configuration file. Information for the virtual memory area protected by power loss. The configuration file of the virtual machine is an important parameter for recording a virtual machine, such as a central processing unit (English: Center Processing Unit, CPU) parameter, a memory parameter, a hard disk parameter, and the like. When the virtual machine generates a page fault interrupt, the determining unit 310 may query the configuration file of the virtual machine according to the virtual memory address of the virtual machine to determine whether the virtual memory address of the virtual machine belongs to the virtual memory area with power failure protection.

In a specific implementation, the information that the virtual memory area address in the host machine is a virtual memory area with power-down protection may be: the host stores information of the virtual memory area whose virtual memory area address is power-down protection in the shared file. . The shared file is a file that can be accessed by both the host and the virtual machine, and can be a txt file, a word file, or the like. When the virtual machine generates a page fault interrupt, the determining unit 310 may query the shared file according to the virtual memory address of the virtual machine to determine whether the virtual memory address of the virtual machine belongs to the virtual memory area with power-down protection.

In a specific embodiment of the present invention, the determining unit 310 is configured to determine that the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to a virtual memory area with power failure protection: the host needs to access the process in the virtual machine. The information of the virtual memory address with the power-down protection, when the virtual machine generates a page fault interrupt, the determining unit 310 queries the information according to the virtual memory address requested by the virtual machine, and determines that the virtual memory address requested by the virtual machine is virtual for the process access. Memory address.

In an embodiment of the present invention, the allocating unit 320 is configured to allocate the physical memory address of the host to the virtual memory address from the physical memory area with power-down protection, and specifically includes: the allocation unit 320 passes the shadow The manner of the page table establishes a mapping relationship between the virtual memory address and the physical memory address of the host, or the allocation unit 320 establishes the physical memory address of the virtual machine and the host by means of an (English: Extended Page Table, EPT) page table. A mapping of physical memory addresses; where virtual memory addresses are mapped to virtual machine physical memory addresses.

Referring to FIG. 4, FIG. 4 is a schematic structural diagram of another host machine according to an embodiment of the present invention. The host includes a processor 410 and a memory 420. The virtual machine runs on the host, and the memory 420 of the host includes A virtual memory area 421 having a power-down protection, the virtual machine includes a virtual memory area with power-down protection, the processor 410 is in communication with the memory 420, and the processor 410 is configured to perform the steps in the foregoing embodiments of the present invention. . It will be understood by those skilled in the art that the structure of the host shown in FIG. 4 does not constitute a limitation to the host machine, and may include more or less components than those illustrated, or combine some components, or different component arrangements. .

Referring to FIG. 5, FIG. 5 is a schematic structural diagram of another host machine according to an embodiment of the present invention. The host includes an MMU 510 and a memory 520. The virtual machine runs on the host, and the memory 520 of the host includes The physical memory area of the electrical protection, the virtual machine includes a virtual memory area 521 with power-down protection, the MMU 510 is in communication with the memory 520, and the MMU 510 is configured to perform the steps in the foregoing embodiments of the present invention.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

Claims

A method for allocating a memory address of a virtual machine, wherein the virtual machine runs on a host, the host includes a physical memory area with power-down protection, and the virtual machine includes a virtual memory area with power-down protection. The method includes:

Determining, by the host machine, that the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to the virtual memory area with power failure protection;

The host allocates a physical memory address of the host to the virtual memory address from the physical memory area with power down protection.
The method according to claim 1, wherein the host machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The virtual machine determines that the virtual memory address of the virtual machine generates a page fault interrupt is a virtual memory area that belongs to the power-down protection, and specifically includes:

The host queries the information according to the virtual memory address, and determines that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The method according to claim 2, wherein the configuration file of the virtual machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The host machine queries the information according to the virtual memory address, and determines that the virtual memory address belongs to the virtual memory area that belongs to the power-down protection, and specifically includes:

The host machine queries the configuration file of the virtual machine according to the virtual memory address, and determines that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The method according to claim 2, wherein the shared file of the host machine and the virtual machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The host machine queries the information according to the virtual memory address, and determines that the virtual memory address belongs to the virtual memory area that belongs to the power-down protection, and specifically includes:

The host machine queries the shared file according to the virtual memory address, and determines that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The method according to any one of claims 2-4, wherein the information of the virtual memory area address being a virtual memory area with power-down protection is specifically: the virtual memory area with power-down protection The start address and the length, or the start address and the end address of the virtual memory area with power-down protection, or the end address and length of the virtual memory area with power-down protection.
The method according to claim 1, wherein the host machine stores information of a virtual memory address with power-down protection that the process in the virtual machine needs to access;

The virtual machine determines that the virtual memory address of the virtual machine that generates the page fault interrupt belongs to the virtual memory area with power-down protection, and specifically includes:

The host queries the information according to the virtual memory address, and determines that the virtual memory address is a virtual memory address accessed by the process.
The method according to any one of claims 1 to 6, wherein said host machine is from said The physical memory area with the power-down protection is configured to allocate the physical memory address of the host to the virtual memory address, including:

The host establishes a mapping relationship between the virtual memory address and a physical memory address of the host.
The method according to any one of claims 1 to 6, wherein the host allocates a physical memory address of the host to the virtual memory address from the physical memory area with power-down protection, specifically including :

The host establishes a mapping relationship between a physical memory address of the virtual machine and a physical memory address of the host; wherein the virtual memory address is mapped to a physical memory address of the virtual machine.
A host machine, characterized in that a virtual machine runs on a host machine, the host machine includes a physical memory area with power-down protection, the virtual machine includes a virtual memory area with power-down protection, and the host machine includes :

a determining unit, configured to determine that the virtual memory address generated by the virtual machine to generate a page fault interrupt belongs to the virtual memory area with power failure protection;

And an allocating unit, configured to allocate a physical memory address of the host to the virtual memory address from the physical memory area with power failure protection.
The host according to claim 9, wherein the host machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The determining unit is specifically configured to query the information according to the virtual memory address, and determine that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The host device according to claim 10, wherein the configuration file of the virtual machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The determining unit is configured to query the information in the configuration file of the virtual machine according to the virtual memory address, and determine that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The host according to claim 10, wherein the shared file of the host machine and the virtual machine stores information that the virtual memory area address is a virtual memory area with power-down protection;

The determining unit is configured to query the information in the shared file according to the virtual memory address, and determine that the virtual memory address belongs to the virtual memory area that has the power-down protection.
The host device according to any one of claims 10 to 12, wherein the information of the virtual memory area address being a virtual memory area with power-down protection is specifically: the virtual memory area with power-down protection The start address and length, or the start address and end address of the virtual memory area with power-down protection, or the end address and length of the virtual memory area with power-down protection.
The host according to claim 9, wherein the host machine stores information of a virtual memory address with power-down protection that the process in the virtual machine needs to access;

The determining unit is specifically configured to query the information according to the virtual memory address, and determine that the virtual memory address is a virtual memory address accessed by the process.
The host according to any one of claims 9 to 14, wherein the allocating unit is specifically configured to establish a mapping relationship between the virtual memory address and a physical memory address of the host.
The host device according to any one of claims 9 to 14, wherein the allocating unit is specifically configured to establish a mapping relationship between a physical memory address of the virtual machine and a physical memory address of the host; The virtual memory address is mapped to the physical memory address of the virtual machine.
A host machine, characterized in that the host machine comprises a processor and a memory, the virtual machine runs on the host machine, the memory of the host machine comprises a physical memory area with power-down protection, and the virtual machine includes An electrically protected virtual memory area, the processor in communication with the memory, the processor for performing the method of any of claims 1-8.
A host machine, comprising: a memory management unit MMU and a memory, the virtual machine running on the host machine, the memory of the host machine comprises a physical memory area with power failure protection, the virtual machine The machine includes a virtual memory area with power down protection, the MMU is in communication with the memory, and the MMU is configured to perform the method of any of claims 1-8.